A hydraulic tailgate parallelogram lifting mechanism for trucks

Abstract

The present invention relates to the field of automobile technology, and in particular to a novel parallelogram lifting mechanism for a hydraulic tailboard of a truck, comprising a hydraulic tailboard hoisting frame and a hydraulic tailboard base component, wherein the hydraulic tailboard base component comprises a loading and unloading platform assembly, a lifting arm, a frame assembly and a hydraulic assembly, wherein a lifting arm mounting seat plate, a lifting cylinder mounting plate and a door-closing cylinder mounting plate are welded at intervals on the frame assembly, wherein the hydraulic assembly comprises a door-closing cylinder and a lifting cylinder, wherein the lifting arm mounting seat plate is provided with a mounting pin shaft hole center A, wherein the loading and unloading platform assembly is provided with a mounting seat assembly, wherein the mounting seat assembly is provided with a mounting pin shaft hole center B and a mounting pin shaft hole center D, wherein the door-closing cylinder mounting plate is provided with a mounting pin shaft hole center C, wherein the lifting cylinder mounting seat plate is provided with a mounting pin shaft hole center E, and wherein the lifting arm is provided with a small shaft hole center F. The above-mentioned structure is provided to reduce manufacturing costs, reduce the dead weight of the hydraulic tailboard of the truck, and save social resources.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a hydraulic tailgate parallelogram lifting mechanism for a truck. Background Art

[0002] Hydraulic tail lifts, installed at the rear of trucks and trailers, are integrated mechatronic and hydraulic equipment that improves loading and unloading efficiency and reduces labor intensity. They have a large inventory and growing demand in the domestic and international logistics equipment markets.

[0003] At present, the regular parallelogram mechanism commonly used on the hydraulic tailgate of trucks has three core characteristics. The lifting cylinder, door closing cylinder and lifting arm all require larger structural dimensions to output the force and torque required for the loading and unloading platform assembly to lift the cargo.

[0004] Therefore, the lifting cylinder, door closing cylinder, and lifting arm all need to be manufactured from larger-sized round tubes, round steel, and steel plates to ensure strength and rigidity. This results in a relatively high deadweight for the parallelogram mechanism. This heavy deadweight also leads to a high deadweight for the entire system, increasing fuel consumption for end-user vehicles and increasing user costs. Summary of the Invention

[0005] The purpose of the present invention is to provide a novel parallelogram lifting mechanism for a hydraulic tailboard of a truck, so as to reduce manufacturing costs and the dead weight of the hydraulic tailboard of the truck, thereby saving social resources.

[0006] To achieve the above-mentioned object, the present invention provides a novel parallelogram lifting mechanism for a hydraulic tailgate of a truck, comprising a hydraulic tailgate hoisting frame and a hydraulic tailgate base component, wherein the hydraulic tailgate base component comprises a loading and unloading platform assembly, a lifting arm, a frame assembly and a hydraulic assembly, wherein the hydraulic tailgate hoisting frame is fixedly connected to the frame assembly, and the two ends of the lifting arm are rotatably connected to the loading and unloading platform assembly and the frame assembly respectively, and a lifting arm mounting seat plate, a lifting cylinder mounting plate and a door closing cylinder mounting plate are welded on the frame assembly at intervals, the hydraulic assembly comprises a door closing cylinder and a lifting cylinder, the lifting arm mounting seat plate is provided with a mounting pin shaft hole center A for mounting the lifting arm, the loading and unloading platform assembly is provided with a mounting seat assembly, and the mounting seat assembly The parts are spaced apart above and below with the center B of the mounting pin hole for mounting the lifting arm and the center D of the mounting pin hole for mounting the door closing cylinder, the door closing cylinder mounting plate is provided with the center C of the mounting pin hole for mounting the door closing cylinder, the lifting cylinder mounting seat is provided with the center E of the mounting pin hole for mounting the lifting cylinder, the lifting arm is provided with the center F of the small mounting shaft hole for mounting the lifting cylinder, the straight line formed by the center A of the mounting pin hole and the center E of the mounting pin hole is perpendicular to the horizontal plane, the straight line formed by the center A of the mounting pin hole and the center C of the mounting pin hole is parallel to the straight line formed by the center B of the mounting pin hole and the center D of the mounting pin hole, and neither of them is perpendicular to the horizontal plane.

[0007] There are two hydraulic tailgate hoisting frames, and the two hydraulic tailgate hoisting frames are spaced apart and arranged on both sides of the frame assembly.

[0008] The novel parallelogram lifting mechanism for the hydraulic tailgate of a truck further comprises a vehicle frame, and the number of the vehicle frames is two, and the two vehicle frames are fixedly connected to the two hydraulic tailgate hoisting frames respectively.

[0009] Wherein, the door closing cylinder and the lifting cylinder are respectively arranged on both sides of the lifting arm.

[0010] The present invention provides a new parallelogram lifting mechanism for a hydraulic tailgate of a truck. Compared with a conventional regular parallelogram mechanism, when the loading and unloading platform assembly is loaded with cargo of the same mass, the force and torque values ​​output by the lifting arm at point B are reduced, and the force and torque values ​​output by the door-closing cylinder at point D are reduced. The material specifications and dimensions of the lifting arm, the door-closing cylinder, and the lifting cylinder can be reduced, and components that can ensure strength and rigidity can be manufactured using smaller-sized steel plates, round tubes, and round steel, thereby achieving the purpose of lightweighting the lifting arm, the door-closing cylinder, and the lifting cylinder, while reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0012] Figure 1 The present invention is a structural schematic diagram of a novel parallelogram lifting mechanism for a hydraulic tailgate of a truck.

[0013] Figure 2 The present invention is a structural schematic diagram of a hydraulic tailboard base component of a novel parallelogram lifting mechanism of a hydraulic tailboard of a truck.

[0014] Figure 3 The present invention is a structural schematic diagram of a novel parallelogram lifting mechanism of a hydraulic tailgate of a truck from another perspective.

[0015] Figure 4 The utility model is a side view of a novel parallelogram lifting mechanism of a hydraulic tailgate of a truck according to the present invention.

[0016] Figure 5 The present invention is a structural schematic diagram of a novel parallelogram lifting mechanism for a hydraulic tailgate of a truck when CD is perpendicular to QP.

[0017] Figure 6 This is a structural schematic diagram of a novel parallelogram lifting mechanism for a hydraulic tailgate of a truck according to the present invention in Example 1.

[0018] 1-Hydraulic tailgate lifting frame, 2-Hydraulic tailgate base component, 21-Loading and unloading platform assembly, 22-Lifting arm, 23-Frame assembly, 231-Lifting arm mounting base plate, 232-Lifting cylinder mounting plate, 233-Door closing cylinder mounting plate, 24-Hydraulic assembly, 241-Door closing cylinder, 242-Lifting cylinder, 3-Frame. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0020] See also Figures 1-6 , Figure 1 This is a structural diagram of a new parallelogram lifting mechanism for a truck hydraulic tailgate according to the present invention. Figure 2 This is a structural diagram of a hydraulic tailboard base component of a new parallelogram lifting mechanism for a truck hydraulic tailboard of the present invention. Figure 3 This is a structural diagram of another aspect of a novel parallelogram lifting mechanism for a hydraulic tailgate of a truck according to the present invention. Figure 4This is a side view of a new parallelogram lifting mechanism for a truck hydraulic tailgate according to the present invention. Figure 5 This is a structural diagram of a novel parallelogram lifting mechanism for a truck hydraulic tailgate of the present invention when CD is perpendicular to QP. Figure 6 This is a structural schematic diagram of Example 1 of a novel parallelogram lifting mechanism for a hydraulic tailgate of a truck according to the present invention. The present invention provides a novel parallelogram lifting mechanism for a hydraulic tailgate of a truck, comprising a hydraulic tailgate hoisting frame 1 and a hydraulic tailgate base member 2. The hydraulic tailgate base member 2 comprises a loading and unloading platform assembly 21, a lifting arm 22, a frame assembly 23, and a hydraulic assembly 24. The hydraulic tailgate hoisting frame 1 is fixedly connected to the frame assembly 23. The two ends of the lifting arm 22 are rotatably connected to the loading and unloading platform assembly 21 and the frame assembly 23, respectively. A lifting arm 22 mounting seat plate, a lifting cylinder mounting plate 232, and a door-closing cylinder mounting plate 233 are welded to the frame assembly 23 at intervals. The hydraulic assembly 24 comprises a door-closing cylinder 241 and a lifting cylinder 242. The lifting arm 22 mounting seat plate is provided with a mounting pin shaft hole center A for mounting the lifting arm 22. The loading and unloading platform assembly 21 is provided with a mounting seat assembly. The mounting seat assembly is provided with a mounting pin hole center B for mounting the lifting arm 22 and a mounting pin hole center D for mounting the door closing cylinder 241, spaced apart from each other. The door closing cylinder mounting plate 233 is provided with a mounting pin hole center C for mounting the door closing cylinder 241. The lifting cylinder 242 mounting seat is provided with a mounting pin hole center E for mounting the lifting cylinder 242. The lifting arm 22 is provided with a mounting small shaft hole center F for mounting the lifting cylinder 242. The straight line formed by the mounting pin hole center A and the mounting pin hole center E is perpendicular to the horizontal plane. The straight line formed by the mounting pin hole center A and the mounting pin hole center C is parallel to the straight line formed by the mounting pin hole center B and the mounting pin hole center D, and neither is perpendicular to the horizontal plane. There are two hydraulic tailgate hoisting frames 1, which are spaced apart on both sides of the frame assembly 23. The novel parallelogram lifting mechanism for the hydraulic tailgate of a truck further comprises a frame 3, two frames 3 being fixedly connected to two hydraulic tailgate hoisting frames 1. The door closing cylinder 241 and the lifting cylinder 242 are respectively arranged on both sides of the lifting arm 22.

[0021] According to this specific embodiment, after the hydraulic tailgate base member 2 and the vehicle frame 3 are connected, they become a functional mechanism of the truck. Figure 1The hydraulic tailgate base member 2 is mainly composed of four major components, namely the loading and unloading platform component 21, the lifting arm 22, the frame component 23 and the hydraulic component 24. These components are connected in an orderly manner and play the core functions of the truck hydraulic tailgate, such as bearing, transmitting force and torque, and ensuring position. Figure 2 As shown. On the frame assembly 23, the lifting arm mounting base plate 231, the lifting cylinder mounting plate 232 and the door closing cylinder mounting plate 233 are welded, which are used to install the lifting arm 22 and the door closing cylinder 241 and the lifting cylinder 242 in the hydraulic assembly 24. Figure 3 As shown. The center A of the mounting pin hole for the lifting arm 22 is located on the lifting arm mounting base plate 231. The mounting base assembly for mounting the lifting arm 22 and the door closing cylinder 241 is located on the loading and unloading platform assembly 21. The center B of the mounting pin hole for mounting the lifting arm 22 is located on the mounting base assembly. The center C of the mounting pin hole for mounting the door closing cylinder 241 is located on the door closing cylinder mounting plate 233. The center D of the mounting pin hole for mounting the door closing cylinder 241 is located on the mounting base assembly. The four hole centers ABCD form a parallelogram mechanism for lifting the hydraulic tailgate of a truck. As shown in the attached figure Figure 4 The center E of the mounting pin hole of the lifting cylinder 242 is located on the mounting base plate of the lifting cylinder 242. The center F of the mounting small shaft hole of the lifting cylinder 242 is located on the lifting arm 22.

[0022] The first core feature is that at any time and at any position when the lifting cylinder 242 lifts the loading and unloading platform assembly 21, the three points ACE are not on a straight line MN, and the line AC is not perpendicular to the horizontal plane G. Point C is offset to the loading and unloading platform assembly 21 by a dimension x, as shown in the attached figure. Figure 4 Show.

[0023] The second core feature is that the two points BD are on a straight line QP, and QP is not perpendicular to the horizontal plane G. Point D is also offset by a dimension x from the loading and unloading platform assembly 21, as shown in the attached figure. Figure 4 Show.

[0024] The third core feature is that when the lifting cylinder 242 lifts the loading platform assembly 21, the closing cylinder 241 is in the closed oil circuit state, always maintaining CD = AB. When CD is perpendicular to QP, a regular parallelogram ABCD with an angle of 90° is formed, i.e., a rectangle ABCD. At this time, AB and CD are not parallel to the horizontal plane Q, nor are they parallel to the load-bearing plane WG of the loading platform assembly 21, as shown in the attached figure. Figure 5 Show.

[0025] Compared to conventional parallelogram-shaped mechanisms, the present invention provides a novel parallelogram-shaped lifting mechanism for a truck hydraulic tailgate. When the loading platform assembly 21 is loaded with the same mass of cargo, the force and torque output by the lifting arm 22 at point B are reduced, and the force and torque output by the door-closing cylinder 241 at point D are also reduced. This allows for reduced material specifications and dimensions of the lifting arm 22, the door-closing cylinder 241, and the lifting cylinder 242. Components with guaranteed strength and rigidity can be manufactured using smaller-sized steel plates, round tubes, and round steel bars, thereby achieving lightweighting of the lifting arm 22, the door-closing cylinder 241, and the lifting cylinder 242. This also reduces manufacturing costs.

[0026] Example 1

[0027] like Figure 6 As shown, the distance Y between point C and point A can be reduced, and the distance Y between points D and B can be reduced by the same amount, while still maintaining the parallelogram relationship between points ABCD. This achieves the beneficial effects of the present invention. Simultaneously, the height of the loading and unloading platform assembly 21 is reduced, achieving a compact structure. The above technical solution reduces the weight of the truck's hydraulic tail lift, conserving social resources.

[0028] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A truck hydraulic tailgate parallelogram lifting mechanism, characterized in that: The hydraulic tailgate comprises a lifting frame and a hydraulic tailgate base component, the hydraulic tailgate base component comprises a loading and unloading platform assembly, a lifting arm, a frame assembly and a hydraulic assembly, the hydraulic tailgate lifting frame is fixedly connected to the frame assembly, the two ends of the lifting arm are rotatably connected to the loading and unloading platform assembly and the frame assembly respectively, the frame assembly is welded with a lifting arm mounting seat plate, a lifting cylinder mounting plate and a door closing cylinder mounting plate at intervals, the hydraulic assembly comprises a door closing cylinder and a lifting cylinder, the lifting arm mounting seat plate is provided with a mounting pin shaft hole center A for mounting the lifting arm, the loading and unloading platform assembly is provided with a mounting seat assembly, and the mounting seat assembly is provided with a mounting pin shaft hole center B and The center D of the mounting pin hole for installing the door closing cylinder is provided, the door closing cylinder mounting plate is provided with the center C of the mounting pin hole for installing the door closing cylinder, the lifting cylinder mounting seat is provided with the center E of the mounting pin hole for installing the lifting cylinder, the lifting arm is provided with the center F of the mounting small shaft hole for installing the lifting cylinder, the straight line formed by the center A of the mounting pin hole and the center E of the mounting pin hole is perpendicular to the horizontal plane, the straight line formed by the center A of the mounting pin hole and the center C of the mounting pin hole is parallel to the straight line formed by the center B of the mounting pin hole and the center D of the mounting pin hole, and neither is perpendicular to the horizontal plane, and point D is offset by a dimension x from the loading and unloading platform assembly.

2. The truck hydraulic tailgate parallelogram lifting mechanism according to claim 1, characterized in that: There are two hydraulic tailgate hoisting frames, which are spaced apart and arranged on both sides of the frame assembly.

3. The truck hydraulic tailgate parallelogram lifting mechanism according to claim 2, characterized in that: The truck hydraulic tailgate parallelogram lifting mechanism further includes a vehicle frame, wherein the number of the vehicle frames is two, and the two vehicle frames are fixedly connected to the two hydraulic tailgate hoisting frames respectively.

4. The truck hydraulic tailgate parallelogram lifting mechanism according to claim 3, characterized in that: The door closing oil cylinder and the lifting oil cylinder are respectively arranged on both sides of the lifting arm.

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